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A device and method for continuously synthesizing polypropylene carbonate polyols

A polypropylene carbonate and polyol technology, applied in the chemical industry, can solve the problems of low gas-liquid two-phase mass transfer rate, incapable of continuous production, low utilization rate of raw materials, etc., so as to improve the utilization rate of CO2, reduce the consumption of raw materials, The effect of reducing equipment investment

Active Publication Date: 2017-03-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above two synthesis processes, due to poor gas-liquid mixing, the gas-liquid two-phase mass transfer rate is low, resulting in high equipment investment, high production energy consumption, low raw material utilization rate, and low product quality; Restrictions, continuous production cannot be carried out, and production efficiency is low

Method used

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  • A device and method for continuously synthesizing polypropylene carbonate polyols
  • A device and method for continuously synthesizing polypropylene carbonate polyols

Examples

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Embodiment 1

[0043] The present embodiment provides a kind of device of continuous synthesis polypropylene carbonate polyol, such as figure 1 As shown, the device comprises a dual-stage jet reactor J1 and a scraped thin film evaporator T2;

[0044] Wherein, the upper part of the two-stage jet reactor J1 is provided with liquid-phase material inlets respectively connected to the propylene oxide and catalyst storage tank V1 and the molecular weight regulator storage tank V2, and the bottom is provided with a gas-phase raw material inlet;

[0045] The two-stage jet reactor J1 is also provided with an exhaust port on the upper part and a liquid phase product output port on the bottom. The exhaust port is connected to the gas-liquid separator T1 through a gas delivery pipeline, and the liquid phase product output port is connected through a pipeline. To the feed port of the scraped film evaporator T2; the bottom of the scraped film evaporator T2 is connected to the polypropylene carbonate polyo...

Embodiment 2

[0050] This embodiment provides a method for continuously synthesizing polypropylene carbonate polyols using the device described in Example 1. The synthesis process of polypropylene carbonate polyols is as follows figure 1 Shown:

[0051] (1) Mix propylene oxide (PO) with catalyst, store in propylene oxide and catalyst storage tank V1, and keep stirring; add molecular weight regulator R(OH) f Stored in Molecular Weight Regulator Storage Tank V2. After starting up, the two storage tanks output raw materials at a certain ratio, and are sent to the dual-stage jet reactor J1 from the top by the delivery pump P1 through the pipeline 1. CO 2 The gas is passed into the dual-stage jet reactor J1 from the bottom.

[0052] (2) After a certain amount of raw materials are accumulated in the dual-stage jet reactor J1, the circulation pump P2 is turned on, and the mixed material is sent to the dual-stage jet reactor J1 from the top through the pipeline 2 to form a circulation. At this ...

Embodiment 3

[0057] This embodiment provides a method for continuously synthesizing polypropylene carbonate polyols using the device described in Embodiment 1. Compared with Embodiment 2, the only difference is: in this embodiment, the dual-stage jet reactor is high 16m, inner diameter 0.8m. Molecular weight regulator is glycerol, the mass dosage ratio of propylene oxide and catalyst is 1000:1; The molar dosage ratio of propylene oxide and molecular weight regulator is 8:1; CO 2 The molar dosage is 1 / 4 of that of propylene oxide, the reaction temperature is 60°C, the residence time is 4h, and the yield is 91%. Compared with loop reactors of the same scale, the reaction energy consumption is reduced by 30%.

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Abstract

The invention provides a device and a method for continuously synthesizing poly (propylene carbonate) polyols (PPC). The device comprises a duplex injection reactor and a scraper film evaporator. Circular reaction is carried out with the duplex injection reactor; when the reaction is finished, a liquid phase product is delivered to the scraper film evaporator from the bottom of the duplex injection reactor; vacuuming and heating treatments are carried out, and PPC is collected from the bottom. According to the invention, the duplex injection reactor is applied, such that gas-liquid mass transfer rate is improved, gas-liquid mixing degree is improved, and reaction rate is improved. Also, the invention provides a continuous production process, such that purposes of reducing investment and production energy consumption, improving productivity and conversion rate, realizing continuous production, and improving production efficiency are achieved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a device and method for continuously synthesizing polypropylene carbonate polyol (PPC). Background technique [0002] Polypropylene carbonate polyols (Poly(propylenecarbonate) polyols, referred to as PPC) is a new type of polyurethane raw material, because its molecule contains a large number of carbonate bonds, the polyurethane material prepared from it as a raw material also has polyether polyurethane Excellent hydrolysis resistance and excellent wear resistance and oil resistance of polyester polyurethane have good market application prospects. [0003] There are two main traditional techniques for synthesizing polypropylene carbonate polyols: a stirred tank reactor as the core and a loop reactor as the core. Among them, the stirred tank reactor is a classic fully mixed tank, and the gas-liquid two-phase contact is made by the agitation of the stirring blade to obtain the pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/34
Inventor 周政张志炳许如银何仁可王云鹏郑植
Owner NANJING UNIV
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